KR100258216B1 - A device for routing SNP packets using asynchronous transmission mode cells, and a method for transmitting and receiving SMP packets in HNSN using asynchronous transmission mode cells - Google Patents

Abstract

PURPOSE: An SNMP packet routing device and an SNMP packet transmission/reception method in HSN using ATM cell are provided to transmit and receives NMS(network management system) message through usable paths, in case that the Ethernet environment in the conventional LAN is unusable. CONSTITUTION: An SNMP(simple network management protocol) message reception part receives a message associated with RSN(remote switching node) information. An LLC/SNAP header creating part creates LLC/SNAP header on the message. An ATM cell changing part changes the message with the created header into ATM cell. An LLC/SNAP header separating part separates the LLC/SNAP header after the changed ATM cell is recovered. A destination address retrieval part retrieves destination address from the recovered message.

Description

A device for routing SNP packets using asynchronous transmission mode cells, and a method for transmitting and receiving SMP packets in HNSN using asynchronous transmission mode cells

The present invention relates to a device for routing an SNMP packet using an asynchronous transmission mode cell, and to a method for routing an SNMP packet using an asynchronous transmission mode cell. In particular, another apparatus that can be used when the Ethernet environment of a local area network (LAN) cannot be used. An apparatus and method for routing through a path are provided.

Looking at the prior art as follows. 1 is a method for routing Simple Network Management Protocol (SNMP) packets according to the prior art.

Generally, network management system (NMS) is used for resource management and traffic management of network equipment.

The network management systems exchange messages between a server and an agent using the SNMP protocol established by ITU-T.

The above SNMP is published in U.S. Patent 5,561,769: Method and apparatus for executing a distributed algorithm or service on a simple network management protocol based computer network.

FIG. 2 is an execution structure diagram of SNMP published in the US patent. As shown in FIG. 2, the first structural diagram (a) is a Transmission Control Protocol / Internet Protocol (TCP / IP) protocol 10 and an ATM ( Asynchronization Transceive Mode) protocol 20 is included, and the second structural diagram (b) includes the TCP / IP protocol 10 removed and the SNMP layer and ATM protocol 20.

In the case of FIG. 2A, the TCP / IP protocol 10 uses a User Datagram Protocol (UDP) layer instead of the TCP layer as shown. Such a method increases overhead in the SNMP process.

In the case of FIG. 2B, the TCP / IP protocol 10 is removed, and the ATM protocol 20 and the SNMP layer directly exchange information. In this way the overhead at the node is reduced.

In addition to the above SNMP, a protocol called CMIP (Common Management Information Protocol) established by ISO is also used.

The above protocol transmits and receives a message using Ethernet of a LAN as a transmission environment.

However, when the Ethernet environment of the conventional LAN is not available, the message should be able to be transmitted and received using another available path.

In the above case, since the SNMP protocol uses UDP / IP as a sub-protocol, the destination should be extracted by analyzing the header of the UDP packet and the header of the IP packet, and the appropriate protocol should be converted and transmitted to the corresponding node.

The present invention was devised to solve the above-mentioned problems of the prior art, and a method and an ATM cell capable of transmitting and receiving NMS messages through another path that can be used when the Ethernet environment of the conventional LAN is unavailable. It is an object of the present invention to provide a routing device for SNMP packets.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention and the accompanying drawings.

1 is a method for routing SNMP packets according to the prior art.

2 is an execution structure diagram of SNMP according to the prior art;

3 is a method for routing inter-node SNMP packets using an ATM cell according to the present invention.

4 is a transmission flow diagram in HSN and a reception flow diagram in RSN.

* Brief description of the main parts of the drawing

170: packet analysis

180: determine whether the packet is own

190: Save IP address and SNMP TEQ_ID FIFO

200: send to SNMP client

In order to achieve the above object, a preferred embodiment of the apparatus for routing an SNMP packet using an ATM cell according to the present invention,

SNMP message receiving unit for receiving a message about the information of the RSN;

An LLC / SNAP header generator for generating an LLC / SNAP header in the message;

An ATM cell conversion unit for generating the LLC / SNAP header and converting the attached message into an ATM cell form;

An LLC / SNAP header separator for removing the LLC / SNAP header after the converted ATM cell is restored;

A destination address extraction unit for extracting a destination address from the restored message;

A message order information management unit; And

And a message order information transmitter.

In order to achieve the above object, a preferred embodiment of the SNMP packet transmission method in the HSN using the TM cell according to the present invention,

A first step of generating an SNMP packet;

A second step of transmitting an Ethernet packet using a lower UDP / IP protocol;

Detecting the packet in the HSN and reading a packet having its own address;

A fourth step of directly transmitting the read packets to the SNMP agent of the HSN when the read packets are messages related to the information of the HSN;

A fifth step of transferring the read packets to the SNMP message processor if the read packets are messages regarding information of an RSN;

A sixth step of extracting a destination address by analyzing the first transmitted UDP / IP packet;

A seventh step of searching for a corresponding node by comparing the address of each node set at the time of initialization of the system by using the extracted destination address;

An eighth step of generating an LLC / SNAP header in the delivered message and attaching the message to the message when the destination node is confirmed; And

And a ninth step of converting the message into an ATM cell and transmitting the message to a corresponding switch port.

In the present invention, when the Ethernet packet is transmitted using the lower UDP / IP protocol, it is preferable to transmit the IP address of the HSN as a destination.

It is preferable to use an ethernet port for the HSN and to have a LAN driver detect the packet.

If the message does not need to be routed to another node, it is recommended to forward it directly to the SNMP agent of the HSN.

Preferably, the message generates and attaches an LLC / SNAP header to the message according to the definition of RFC 1484.

It is preferable to convert the message into the form of an ATM cell by using the NIA connected to the node and the PVC set up.

An embodiment of a method for receiving an SNMP packet in an RSN using an ATM cell according to the present invention for achieving the above object,

Receiving an ATM cell;

Restoring a message from the ATM cell;

Removing the LLC / SNAP header of the recovered message;

Extracting a destination address from the restored SNMP packet;

Confirming whether the packet is properly transmitted using the extracted destination address;

Sending the packet to an SNMP agent;

Analyzing the message, extracting order information, and managing the message together with a source address using a buffer;

Verifying a destination address when a request for transmission of a response from the SNMP client to the NMS server comes;

After checking the destination address, checking order information, adding a corresponding IP header from a buffer, and generating an LLC / SNAP header; And

Converting the message to an ATM cell and transmitting the message through a corresponding NIA board.

In the present invention, it is preferable to extract a destination address from the restored SNMP packet to check whether the packet is properly transmitted.

Preferably, the packet is transmitted to the SNMP agent according to the UDP protocol.

Due to the nature of the UDP protocol, a loss of transmitted packets may occur. Therefore, it is preferable to manage order information using a buffer for messages exchanged with an SNMP client.

When a request to send a response from an SNMP client to an NMS server comes in, it is desirable to check the destination address and sequence information.

After confirming the destination address and the order information, it is preferable to add the corresponding IP header from the buffer, generate the LLC / SNAP header, and convert the restored SNMP packet into the form of an ATM cell for transmission.

Hereinafter, a detailed operation principle of the present invention will be described with reference to the drawings. 3 is a routing method of inter-node SNMP packets using an ATM cell according to the present invention, and FIG. 4 is a transmission flowchart in HSN and a reception flowchart in RSN.

If you want to send resource information and call setup and release message from NMS system to each node, first generate SNMP packet, and use Ethernet UDP / IP protocol to transfer Ethernet packet to HSN (Host Switching Node) IP address. Send as a destination.

The HSN uses an Ethernet port and a LAN driver detects the packet and reads a packet having its own address. If the read packet is a message about information of the HSN, that is, a message that does not need to be routed to another node, the packets are transferred to the SNMP agent of the HSN.

If the packet is a message about the RSN (Remote Switching Node) is delivered to the SNMP message processing unit.

The RSN message processor extracts a destination address (IP address, UDP port number) by first analyzing a transmitted UDP / IP packet and finds a corresponding node by comparing with an address of each node set at the initialization of the system. When the destination node is determined, the LLC / SNAP header is generated and attached to the message according to the definition of RFC 1484 in the delivered message.

After attaching the LLC / SNAP header to the message, the LLC / SNAP header is converted into an ATM cell using a NIA (Node Interface Assembly) connected to the corresponding node and a PVC (Permanent Virtual Circuit).

Meanwhile, the RSN node receives the transmitted ATM cell to recover the message and remove the LLC / SNAP header. The destination address is extracted from the restored SNMP packet to check whether the packet is properly transmitted, and the packet is transmitted to the SNMP agent according to the UDP protocol. At this time, since the packet may be lost due to the characteristics of the UDP protocol, messages transmitted and received with the SNMP client manage order information (Request ID) using a buffer. In other words, the message transmitted from the NMS server is parsed to extract order information and managed together with the source address using a buffer (FIFO, First In First Out).

When a request for transmission of a response is sent from the SNMP client to the NMS server, the destination address is checked, the sequence information is checked, the corresponding IP header is added from the buffer, the LLC / SNMP header is generated, and the packet is converted into an ATM cell. Transmit through NIA board.

The SNMP packet in the form of ATM cell received in the HSN removes the LLC / SNAP header and transmits it to the Ethernet through the LAN driver.

The present invention configured as described above provides a method for supporting the SNMP protocol through another path that can be used when the Ethernet environment of a normal conventional LAN cannot be used.

In the present invention, only the method using the ATM interface is presented, but it is effective to route the SNMP packet by LLC / SNAP encapsulation for all interfaces that do not use the Ethernet environment, such as a frame relay. have.

In addition, since the SNMP packets transmitted between nodes as described above may be lost, there is an effect that the entire SNMP protocol may be operated by managing the order information using a buffer.

Claims (12)

SNMP message receiving unit for receiving a message about the information of the RSN; An LLC / SNAP header generator for generating an LLC / SNAP header in the message; An LLC / SNAP header separator for removing the LLC / SNAP header after the converted ATM cell is restored; An ATM cell conversion unit for generating the LLC / SNAP header and converting the attached message into an ATM cell form; A destination address extraction unit for extracting a destination address from the restored message; An apparatus for routing an SNMP packet using an ATM cell, comprising: a message sequence information management unit and a transmission unit managing the sequence information of the messages using a buffer. Detecting and reading an Ethernet packet transmitted from an NMS in the HSN; If the read packets are messages related to the information of the HSN, forwarding them to the SNMP agent of the HSN; If the read packets are messages relating to information of an RSN, forwarding them to an SNMP message processor; Extracting a destination address by analyzing the first transmitted UDP / IP packet; The SNMP message processing unit using the extracted destination address to find the node by comparing the address of each node that is set at the time of system initialization; If the destination node is confirmed, generating an LLC / SNAP header to the forwarded message and attaching the message to the message; And And converting the message into a form of an ATM cell and transmitting the message to a corresponding switch port. The method of claim 2, wherein an Ethernet port is used for the HSN, and a LAN driver detects and reads the packet. The method of claim 2, wherein the message is transmitted to the SNMP agent of the HSN when the message does not need to be routed to another node. 3. The method of claim 2, wherein the message generates and attaches an LLC / SNAP header to the message according to the definition of RFC 1484. The method according to claim 2 or 6, wherein the message is converted into an ATM cell using a NIA connected to the node and a PVC set in the form of an ATM cell. . Receiving an ATM cell; Restoring a message from the ATM cell; Removing the LLC / SNAP header of the recovered message; Extracting a destination address from the restored SNMP packet; Confirming whether the packet is properly transmitted using the extracted destination address; Sending the packet to an SNMP agent; Analyzing the message, extracting order information, and managing the message with a source address using a buffer; Verifying a destination address when a request for transmission of a response from the SNMP client to the NMS server comes; After checking the destination address, checking order information, adding a corresponding IP header from a buffer, and generating an LLC / SNAP header; And Translating the message to an ATM cell and transmitting the message through the corresponding NIA board. 8. The method of claim 7 wherein the destination address is extracted from the restored SNMP packet to determine whether it is a correctly transmitted packet. The method of claim 7 or 8, wherein the packet is transmitted to an SNMP agent according to a UDP protocol. 10. The method of claim 9, wherein the packet is transmitted due to the characteristics of the UDP protocol, so that the order information is managed using a buffer for messages exchanged with the SNMP client. 8. The method of claim 7 wherein the destination address and sequence information are verified when a request to send a response is sent from the SNMP client to the NMS server. The ATM according to claim 7 or 11, wherein after confirming the destination address and the order information, the corresponding IP header is added from the buffer and the LLC / SNAP header is generated to convert the restored SNMP packet into the form of an ATM cell for transmission. SNMP packet routing method in RSN using cell.

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